Real time clock ICs

[Eng4444]

The best thing is to have a huge project done ahead of time... everybody there is still working.

I checked all the comments i have. Thank you for your cooperation :-)

how would i know that they should have been D4 throught D7.... i do not work with electronics and i was doing exactly as it was said.

i will try all what was said in 2 hours and then give feedback.

i wish a nice day for everybody!

[Eng4444]

Seems we sent our posts in the same time!


SO you are saying that i can connect to the lower 4 bits as long as i keep the "defines" in the program?

And in case i will use from D4 to D7 i should change the "defines".
So what to change in this part if so?

"

Define LCD_DREG PORTA ' Port for LCD Data
Define LCD_DBIT 0 ' Use lower 4 bits of Port
Define LCD_RSREG PORTA ' Port for RegisterSelect (RS) bit
Define LCD_RSBIT 6 ' Port Pin for RS bit
Define LCD_EREG PORTA ' Port for Enable (E) bit
Define LCD_EBIT 7 ' Port Pin for E bit
Define LCB_BITS 4 ' Using 4-bit bus
Define LCD_LINES 2 ' Using 2 line Display
Define LCD_COMMANDUS 2000 ' Command Delay (uS)
Define LCD_DATAUS 50 ' Data Delay (uS)

"

i'll check this this thread when i arrive to my Lab.

By the way,
Don't you think people that this thread reached the highest score of visits?! hehe.

Let's reach the highest possible number! :-)

[Melanie]

There is a very basic software only (no RTC chip required) elapsed timer demo, ready to run, just an LCD and one Button only, at the bottom of this thread here...

http://www.picbasic.co.uk/forum/showthread.php?t=3423

[Eng4444]

Hello,

Here i arrived and will test your program....

honestly, i liked the first program because it gives time and date. I really hope it will work.

By the way, don't think that i will say that "i" did it. But i will show the source of it and all the posts and replies for this thread.

i really hope i'll ba able to see something on LCD.

First thing is that i will change the bits from D4 TO D7 and connect them to PIC; moreover, i will put 4.7 K resistors and 0.1uF Capcitors

More infos to come soon!

[Eng4444]

I connected all the circuit with the new changes and then downloaded the program after adding the following:

@ DEVICE pic16F628A, INTRC_OSC_NOCLKOUT
' System Clock Options
@ DEVICE pic16F628A, WDT_ON
' Watchdog Timer
@ DEVICE pic16F628A, PWRT_ON
' Power-On Timer
@ DEVICE pic16F628A, BOD_ON
' Brown-Out Detect
@ DEVICE pic16F628A, MCLR_OFF
' Master Clear Options (Internal)
@ DEVICE pic16F628A, LVP_OFF
' Low-Voltage Programming
@ DEVICE pic16F628A, CPD_OFF
' Data Memory Code Protect
@ DEVICE pic16F628A, PROTECT_OFF
' Program Code Protection

So now , when i compile with microcoe studio it compiles successfully. Bu when i want to program the IC, it gives a message :

" this program contains EEDATA - EDATA and this part will be discarded"

so i press "OK" and it begins programming.

during the process, when it arrives to " Programming EEDATA section" it stops and gives this message:
" Programming time-out or connection error"

For sure i have no connection error because i tried a small program on another IC and it worked.

any idea?

[Melanie]

Not from me, I don't use Microcode studio and avoid any questions on the topic.

If you compiled your MN1307.bas code from a DOS Window...

PBP -p16F628 MN1307 -v

or

PBP -p16F628A MN1307 -v

depending which version you're using... It will compile.

Likewise I can't comment on your method of programming the actual PIC.

[Eng4444]

A real BIG thanks for this nice code.

Here it worked :-)

it is displaying time and date.

Still a small problem that i will describe in details:

1- it says to chose between 24 hours or 12 hours and this is working fine.
2- chose time and date and things are also fine. In fact i chose today's date and time.

3- when i press the middle button again to save, it says: MEMORIZED.

but since then, time is not being updated on the screen. It is left all the time as i have set it since the beginning. I have waited 30 minutes and nothing has changed.

By the way, i used the 3V battery and noticed that everything was changed to 4 whether by number or place. What i mean is:
04:04:04
04 Apr 2004

so what do you suggest to do?

more than 3/4 of the work is done and i need to continue it till the end.

thanks in advance.

By the way Bobk,

i didn't use any capacitors but you were right about D4 till D7.
so help me to finish it....

I'll check in 1 hour.

Bye.

[BobK]

Hi Eng4444,

I'm glad to hear that you got it working. Now put the .1uF capacitors across each device and reset the project and see if it works. I slept in this morning so I'm running late for work. Keep plugging away!

BobK